The Purple-Wigged Kid on the Left Is Now an Actor Famous For Raunchy Comedies: Guess Who! (PHOTOS)

Who's the Kid Rocking Out in a Purple Wig?

The 29-year-old movie star in question landed his breakout role in a 2007 Judd Apatow-produced comedy, and earlier this year he appeared in a cop film opposite a very sexy man.Still stumped? Click through for the reveal!